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Adult 15 female Japanese monkeys showing regular menstrual cycles were subjected to the daily blood sampling for the measurement of estradiol (E2), progesterone (P) and biological LH in the mating season. Monkeys were maintained under controlled conditions in a standardized environment. Of the 35 cycles observed, 18 (51.4%) were estimated as anovulatory cycles and 17 (48.6%) were ovulatory cycles. The anovulatory cycles were classified into three types according to the peak level of E2 (Type I: E2 less than 50 pg/ml 3 cycles, Type II: E2 less than 170 pg/ml 7 cycles, Type III: E2 greater than 170 pg/ml 8 cycles). The ovulatory cycles were classified into two Types according to the peak level of P (Type IV: P less than 5.0 ng/ml 5 cycles, Tyep V: P greater than 5.0 ng/ml 12 cycles). The menstrual cycle was 27.5 +/- 7.8 days. The differences between mid cycle LH surge and P level in Type IV and in Type V were statistically significant. It was revealed that female Japanese monkeys kept under controlled condition in the mating season showed high incidence of various types of anovulatory cycles and that the ovulatory cycles with low P elevation in the mid luteal phase showed low LH and P secretions on the mid cycle date.

Changes of Plasma Estradiol, Progesterone and LH Level in the Menstrual Cycle of the Adult Female Japanese Monkey during the Mating Season